Divergent Metabolic Changes in Rhizomes of Lowland and Upland Switchgrass (Panicum virgatum) from Early Season through Dormancy Onset

Palmer, Nathan A.; Sarath, Gautam; Bowman, Michael J.; Saathoff, Aaron J.; Edmé, Serge J.; Mitchell, Robert B.; Tobias, Christian M.; Madhavan, Soundararajan; Scully, Erin D.; Sattler, Scott E.

doi:10.3390/plants12081732

Title: Divergent Metabolic Changes in Rhizomes of Lowland and Upland Switchgrass (Panicum virgatum) from Early Season through Dormancy Onset

Journal Article · Fri Apr 21 00:00:00 EDT 2023 · Plants

DOI:https://doi.org/10.3390/plants12081732· OSTI ID:1971261

; Sarath, Gautam; Bowman, Michael J.; Saathoff, Aaron J.;

; Mitchell, Robert B.; Tobias, Christian M.; Madhavan, Soundararajan;

;

High-biomass-yielding southerly adapted switchgrasses (Panicum virgatum L.) frequently suffer from unpredictable winter hardiness at more northerly sites arising from damage to rhizomes that prevent effective spring regrowth. Previously, changes occurring over the growing season in rhizomes sampled from a cold-adapted tetraploid upland cultivar, Summer, demonstrated a role for abscisic acid (ABA), starch accumulation, and transcriptional reprogramming as drivers of dormancy onset and potential keys to rhizome health during winter dormancy. Here, rhizome metabolism of a high-yielding southerly adapted tetraploid switchgrass cultivar, Kanlow—which is a significant source of genetics for yield improvement—was studied over a growing season at a northern site. Metabolite levels and transcript abundances were combined to develop physiological profiles accompanying greening through the onset of dormancy in Kanlow rhizomes. Next, comparisons of the data to rhizome metabolism occurring in the adapted upland cultivar Summer were performed. These data revealed both similarities as well as numerous differences in rhizome metabolism that were indicative of physiological adaptations unique to each cultivar. Similarities included elevated ABA levels and accumulation of starch in rhizomes during dormancy onset. Notable differences were observed in the accumulation of specific metabolites, the expression of genes encoding transcription factors, and several enzymes linked to primary metabolism.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AI02-09ER64829; SC0001490

OSTI ID:: 1971261

Journal Information:: Plants, Journal Name: Plants Vol. 12 Journal Issue: 8; ISSN 2223-7747

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Netherlands

Language:: English

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